Milking machine



May-l3, 1930. E. T. JANssoN *1,758,443

' MILKING MACHINE Filed' Aug. 24, 192s Patented May 13, 1930 ERNST TAGE JANssoN, oF STOCKHOLM, :sv/'EDEN7 AssIGNoE To THE DE LAVAL sE'rA-V .RATON COMPANY, oE NEW YoEig N. Y., A ooEEoEATIoNoE NEW JERSEY MILKING MACHINE Appliczmonl mea Aegst 24, iaaarse'riai No. 301,885, and in sweden october ao, 1927.

In milking machines operated by'vacuum and comprising 1 a milk receiving 'pail 'interposed between the vacuumpipe line ,and the teat cups, the milk is liable, occasionally and 5 at irregular intervals, to bacterialinfection. In ordinary operation, the'milk suiers no contamination, vbut occasionally,without apparent cause, the milkl develops an abnormally high content of bacteria. Y

lo Careful Vi-nvestigations disclose thatthe source of contamination is the small amountv ofliquid that occasionally enters the milk pail from the fixed vacuumV pipe line. l milking lmachine' system, bacteria-carrying vapor may enter with the air and condense into a liquid, and if a small amount of such liquid enters the milk, the latter aiords a vehicle for the development of a powerful bacterial growth. In vacuum operated milking machines, the entry of such vapor may not cause any contamination of the milk, because the normal vHow of air is from the milk pail to the vacuum pump, which tends not only to prevent a. flow of any liquid in the reverse direction but also tok withdraw from the system any condensate that may form therein'. If, however, from any cause, the air current is temporarily weakened, or if it is altogether arrested, as it is when the operation Vof the machine is stopped, a very small quantity of liquid may enter the milk ail. p The likelihood of this source of contamination is diminished by so arranging the detachable hose connection from the iXed vacuum pipe to the milk pail that the opening from the pipeline through'the usual plug valve cock to the hose shall be at a substan- In any connects with the vacuum pipeline when the f. cock is shut 0E, so that any,,bacteria-containA ingk vapor present'in the pipe line therefore, condenses in the hollow of the plug'valve,y and when the hose from the milkpail is'con-fm; nectedv withy the cock and the valve is opened,l n the condensate penetrates into the hosecon nection and thence finds its way into the pail. In otherl constructions,:wherein the plug v valve is not'connected with the vacuum pipe j line when the cockv is shut 0E, condensateA forming, in the air passage Vor in one bend thereof, between. the valve and the vacuum pipe, tendsto flow by gravity toward thel valve, and any condensate that4 forms inthe passage of the valve itself, .when the valve is closed, tends, when the valvev is opened, to ilow by gravity toward themilk receiver.'` The condensate may thusrpenetrate'into the` hose connection and find itsway into the pail; f The present invention comprises a construc- I Y tion involvingthe use of an angularly bentl cock, positioned on the Xed vacuum pipeline as above described, but. so combinedwith Va valve, suchas a plug valve or disc valve, that there isA no" serious risk that any condensate that forms in the cockor plug while the `connection to the milk pail is shutfo will enter the hose Y connection vto the pail When'- thek latteris againoperatively connected with the vacuum pipeline.

The drawings show three of many different possible embodiments of the invention.

Fig. 1 is a simplilied diagram of .that part of a milking machine comprising the; main vacuum pipeline, one of the` teat cups,

the milkk pail and connections. v Y llFig. 2 isa cross-section through thevacufum pipe line, an angular cock and a plug valve, embodying one iormv ofmy invention. Fig. Sis a cross-sectionthrough the .valve of Fig. 2 withthe valve turned off. p f

Fig. 4 is a similarv view of the same` comy bination somewhat differently arranged.

Fig. 5 isa similar view of the same com-v 95 bination, in which a disc valve replaces a plug` valve.v p yFrom the teat cups aextends amilk pipe b to a'milk pail c. In certain types of ma- Y chines, the teat cups are provided with pulsa 100 Y tion Vchambers and means, well known in the The fixed main vacuum pipe e, which extendsffrom a vacuum pump through the barn,

is' equipped with' cocks, to' each' of which` is' connectible onev end oa hose d, whose' other end is connectible with the milk pail.

InFig. 2, one branch f of an angular cock" extends from pipeeupwardlyand diagonal;` lyrto a valvehousing L from which extends dowrmardf'and` diagonally! the other branch g' othe'fcocl'r, whichi is adapted to receive theI with) a passage k. The Vplugf.,valve isiadaptf' ed tofbe turned, on: af verticalfaxi's, by means oflj' theA handle either *into position tol cause passagecfto connectithe passages in1branches; f' an'd g'gor intoposition tob'ring.; passage 7c' i whollyoutofrregisterfwithboth the cock-pasf- When the| valve?V is:` closed,` no vapor can penetrateiit: and. there canV be.` no condensation the passage 7c except ofthe small amount oitvapor` that may betpresent there at' thefmolnentthe'f valve isi closed. While this anlount oi?4 condensate v` may.Y ber so smallk as `to be` harmless in practice,l the` possibility vofits` subsequent penetration into7 branch g is! preventedr by" so" inclining thebottom'` ofi passage` lo they direction. of' its4 lengthfV that,

y thatis.established` at the" instant theY valve is? P1P@ l Y nothe'r embodiment of the invention'is when the valve is opened, any condensate? therein will? tend: t'of` flow out toward the branch' su`ch\ overflow beingrendered. certa'inl by" the? outwardlyflowing-i air current opened;` u y i Another embodiment of thef invention 1sshown inl Fig. 4, Whereinim' and nrrepresent thexangular branches of thecock,Loithefintern mediate housing and p the plug valve. InV

thisiconstructifontthe*plugfrvalvedspositioned betweenth'evacuumpipe andthe angleofrthe;

ben'tl passage 4andi turns onar horizontal' axis.

` NoIfspecial` shape'sneefd be given the passageini plug'ifrvalve p, since;V when ther vaive'i isf opened, the directioni ofi inclinatfiomoi the' um pipe e and cannot possibly escape into the branch s.

By means of any of the above described constructions, or of such modications thereof as are Within the skill of the mechanic, absolute-,securityv against contamination of milkby infected condensed. liquid is airorded.

What I claim is:

In a milkingV machine, the combination, withA vacuumt pipe andimilk' receiver', o a` cock-4 having a chamberedi housing` above said pipe, a branch extending from the pipe to the housing having a passage extending downvvardyf-rom thevhousingchamber to the pipe, a second branch having a free end extendingfrom' the housing. and*7 having a passage .therein extending-downwardly from the' chamber, the bottomaoii` the opening lfromt-he lastppassage tothe' chamber being above the bottom: of the opening; romtheV first passage to;thechamdoer, and a: plug in the chamber having: a@ passage therethrough, the bottomY of said. passage` sloping downwardly Vfrom the opening to passagein; the second? branch to the-` opening in theirsti mentionedy branch, when the-valveis` open i In testimony:A of' which invention, I? have hereunto set my hand,v at: Stockholm,` Swe` den, on this 9th dayofihugust,l928.

ERNSTTAEGE JANSSON.`

pass'afgef is downward towardr the; vacuum shown in Figw 5.V The cock, comprising branches 7' ands andian'interniediatehousing;

gvis'closable'by means of a' discva'lve o, which is preferably seatedon theinner end? oit the@ branchl 81 whichi projects slightly into the 

